Malfunction causes Orange Line delays

8:22 p.m. Update: Metro says the track circuit malfunction has been resolved, but delays continue in both directions on the Orange Line.

7 p.m. Update: Metro spokeswoman Cathy Asato said there is a switch problem outside Vienna on the outbound track. Trains are single-tracking, "but we still have significant delays," she said. Crews are on the scene, but Metro did not have an estimate of when normal service might resume.

6:50 p.m. Update: Tyson reports that a train operator informed passengers that all the trains ahead of them (she's at Clarendon) are unloading their passengers.

More details to come.

6:47 p.m. Update: The Post's Ann Scott Tyson repoerts that she is on an Orange Line train that has been at a standstill for 20 minutes.

Original post: A track circuit malfunction outside of Vienna Vienna/Fairfax-GMU Station is causing delays in both directions on the Orange Line.

If these are affecting your commute, post a comment to share what's happening with other riders or send us an e-mail at transportation@washpost.com.

Track circuit malfunction, eh? This from the gang who couldn't maintain a functional system of track sensors, leading to several deaths on the Red Line last year. And of course there was no ventilation in the train that I was stuck on last night. Catoe had the decency to resign on account of his inability to keep MetroRail functioning safely. It is time for the Board of "Directors" to follow his honorable example.